The endgame of Supernatural season 7 is in sight, and the
penultimate episode is going to offer some major challenges for Sam and
Dean. The brothers will race to defeat the Leviathans in the final five
episodes, and it will involve some memorable enemies from the past.

The CW has released the official synopsis for May 11's penultimate episode, "There Will Be Blood." Check it out:

"In order to defeat Dick Roman and the Leviathans, Sam and Dean must locate three key items. Castiel helps with one but for the last objects, the Winchesters must face two of their strongest opponents - an Alpha (guest star Rick Worthy) and Crowley. Meanwhile, Bobby tries out a new ghost trick that ends up being very dangerous."

So not only will we get more Mark Sheppard as Crowley, but Rick Worthy is returning as the Alpha Vampire. Fans will remember the big bad Alpha Vamp from two early season 6 episodes. I guess that whole Alpha and Mother of All stuff is coming back. Maybe I was quick to judge these past two Sera Gamble seasons and there is some grand unifying mythology that connects all of the seemingly unconnected plot strings.

Will Sam and Dean find all three horcruxes (come on, I can't be the only person who thought it)? And what is Bobby's deadly ghost trick? And how cool is an episode that features Cas, Bobby, Crowley, Dick and the Alpha Vamp? That's a whole lot of grade-A guest cast.